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-   -   Flat collectors (https://classracer.com/classforum/showthread.php?t=40466)

Mark Yacavone 04-29-2012 12:53 AM
Re: Flat collectors
 
Quote:
Originally Posted by joespanova (Post 323855)
This all originates from the situation of having a friend needing a set of headers for his 85 Bird ( small Chevy ).

He has a nice 400 ( Brodix cnc'd , 14-1 comp , Tim Cole put together some cam lobes for me ) just a decent combo. I "THINK" with this engine and a car that weighs in the neighborhood of 2700 lbs , 9.30s to 9.50s will be no problem. I did the engine so I know its a nice combo .

However , for what he's doing with it Stahl , Lemons etc etc were a little pricey..............so he opted for the Hedmans ( Hustlers )......all they had in an 1 7/8 was a "flat collector" deal , for his car.

I know they are less popular , but I have no idea what the "adverse" effects could be.
Just curious as to what difference it would make.... if it's a bracket car?

joespanova 04-29-2012 04:29 AM
Re: Flat collectors
 
Quote:
Originally Posted by Mark Yacavone (Post 323900)
Just curious as to what difference it would make.... if it's a bracket car?
Well , since you asked , none ........I suppose. LOL

But I'm not a bracket racer by nature "at all".

I figure class racers may have some useful info though , if anyone would know if its not a good design , they would.

Kevin Lang 04-29-2012 07:56 AM
Re: Flat collectors
 
Joe you also have to run a remote oil filter with them because you cant get at the oil filter with the flat collector. just one more draw-back to that style......sorry.

joespanova 04-29-2012 08:22 AM
Re: Flat collectors
 
Quote:
Originally Posted by Kevin Lang (Post 323912)
Joe you also have to run a remote oil filter with them because you cant get at the oil filter with the flat collector. just one more draw-back to that style......sorry.
Not in this case..........we didnt. There is approx 1 1/2 between the filter and collector.

Using a K&N HP2002

Chad Rhodes 04-29-2012 12:10 PM
Re: Flat collectors
 
Quote:
Originally Posted by Kevin Lang (Post 323912)
Joe you also have to run a remote oil filter with them because you cant get at the oil filter with the flat collector. just one more draw-back to that style......sorry.
Not true, although you will make a mess all over the headers changing it.

chris ok 04-29-2012 01:04 PM
Re: Flat collectors
 
lay a pig mat over the headers before dropping the filter. I finally started doing it since I got my regular headers coated.

FastbackTom 05-10-2012 12:28 AM
Re: Flat collectors
 
This may seem a little irrelevant to some, but the VW Formula Vee guys have debated flat style 4-1 versus the more traditional square 4-1 collectors for a long time. Those guys run old, stock, small port single carb engines that have been tweaked by some pretty bright guys since the 1960's. At 50-some-odd hp output, they'd give their eye teeth for 3hp. Since you don't see one style or the other exclusively in use, my guess is there isn't a lot to be lost, or gained, if the rest of the header has been sized and constructed right.


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